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Numerous rounds of erosion. Can be by attrition-rocks smacking together and breaking each other up, Abrasion-Rocks scraping against each other like sandpaper, corrosion-natural acids dissolving the rock. There's also one where plants grow and force rocks apart etc

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because of Erosion
sure i will tell you more
a combination of the physical breaking down of rock into smaller pieces and chemical weathering of minerals to form other minerals more stable for the conditions.

A mineral that formed at 750C and in absence of water will generally not remain chemically stable at room temperature and in the presence of water. A few, such as quartz, do remain stable, but most, particularly feldspars and the ferromagnesian minerals, are not the stable structures at lower temperatures when in the presence of
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